This topic draws me and draws me.
Regarding over-emoting. I'm not a great singer -- certainly worse than all but a very few professionals -- but occasionally I impress someone. Suzanne. Ain't no Cure for Love. A few other songs. I've had people I respected say your version, Steve, was the best I ever heard. But it *never* happens on my favourite songs.
My final comments: the most important part is getting to where you enjoy hearing *some* of your songs sung by yourself to yourself. The hardest part is learning to confidently sing *some* of your songs with other people. After that, it's all down hill. But you'll never be able to sing *all* the songs you want to as well as you'd like to.